If P(1) = P(3) in Poisson's distribution, what is the mean?

1. 6
2. 7
3. 2
4. 3

For a binomial probability distribution; the probability of failure is 4/5 and variance is 4. The value of standard deviation _______________.

1. 4
2. 5/4
3. 4/5
4. 2

The Variance of hypergeometric distribution is given as __________

1. n * k * (N - 1) * (N - n) / [N2* (N - 1)]
2. n * k * (N - k) * (N - 1) / [N2* (N - 1)]
3. n * k * (N - k) * (N - n) / [N2* (N - k)]
4. n * k * (N - k) * (N - n) / [N2* (N - 1)]